Why did the POCO X7 Pro sound quality get worse after the HyperOS update?

What Was Reported?

In December 2025, Xiaomi's HyperOS Weekly Bug Report listed a Dolby Audio quality problem affecting build OS3.0.5.0.WOJMIXM. The report described the Dolby Audio performance on this build as "non-ideal" and inconsistent, and stated that Dolby Laboratories had provided a fix which Xiaomi was testing for compatibility and stability before release.

The bug report named the POCO F7 as the affected device. However, the same build number also appears in the Global stable ROM listings for the POCO X7 Pro / Redmi Turbo 4.

Which Build Was Affected?

The affected Global build was:

OS3.0.5.0.WOJMIXM

This build was distributed during the HyperOS 3 rollout. ROM listings for the POCO X7 Pro / Redmi Turbo 4 confirm that this build number belongs to the Global stable branch for this device family.

If your POCO X7 Pro is running this version and the sound quality became noticeably worse after the update, checking for a newer HyperOS version should be the first step.

What Happened With the Affected Build?

According to the HyperOS bug report, Xiaomi took the following actions at the time the issue was identified:

1. Discontinued the affected build. Distribution of the affected build was halted to prevent more users from receiving it.
2. Obtained a fix from Dolby Laboratories. Dolby provided an official correction, which Xiaomi was testing for compatibility and stability.
3. Planned to release the fix through monthly software updates. The correction was scheduled to be integrated into the HyperOS system structure.

Since then, newer HyperOS builds have been released for the POCO X7 Pro, with Global builds now reaching versions well beyond the affected build.

Is There a Separate Speaker Noise Issue?

Yes. Xiaomi has documented a separate issue affecting the POCO X7 Pro at high volume. This issue is unrelated to the 2025 Dolby Audio report.

According to Xiaomi's official support documentation, speaker noise at high volume on the POCO X7 Pro was caused by mismatched audio parameters, rather than a hardware failure. Xiaomi states that this issue was addressed in a system update with optimized audio parameters to improve sound quality and prevent noise at high volumes.

If your phone produces noise or distortion mainly at high volume, install the latest available OTA update before assuming that the speaker itself is damaged.

What Should You Do If Your Sound Quality Got Worse?

If your POCO X7 Pro sound quality became worse after a HyperOS update, follow these steps:

1. Check your HyperOS version. Go to Settings → About phone and check the build number.
2. If you are on OS3.0.5.0.WOJMIXM, check for a newer update. Go to Settings → About phone → System updates. Newer HyperOS builds have since been released, so updating is the appropriate first step if you are still running the affected version.
3. Test Dolby Atmos on and off. Play the same track or video at the same volume with Dolby Atmos enabled and disabled to determine whether the sound-processing setting is contributing to the problem.
4. Test another app. If the problem only occurs in one app, it may not be caused by the system audio processing.
5. If the problem continues on a current HyperOS build, check for other causes. Speaker blockage, audio settings, Bluetooth routing, or a hardware problem can produce similar symptoms.

How to Check If You Are on the Affected Build

To verify your current HyperOS version:

1. Open Settings on your POCO X7 Pro.
2. Go to About phone.
3. Look for the build number under the HyperOS version information.
4. Compare it with OS3.0.5.0.WOJMIXM.

If your build number matches, you are on the affected version. If you are running a newer build, this specific build-related issue is less likely to explain your current sound problem.

Final Answer

In late 2025, the HyperOS 3 build OS3.0.5.0.WOJMIXM was associated with a documented Dolby Audio quality issue. The HyperOS bug report identified the affected device as the POCO F7 and stated that Xiaomi had received a Dolby-provided fix which was being tested. The same build number also existed for the POCO X7 Pro in the Global stable channel, so users on either model may have been affected by the build's rollout.

If your POCO X7 Pro developed noticeably worse sound immediately after that update, check the HyperOS build before treating the problem as a speaker hardware fault. If you are already on a newer build, investigate other audio settings and hardware-related causes instead of assuming that the old Dolby Audio report is responsible.